Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5bf3933600c5a1…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 23:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 359978db4d0d9a23e0912e778e1be03c SHA-1: aedf45cf9dc8de0572b27aba036416349dcfca3a SHA-256: 7b5bf3933600c5a19b854f6ca24084d93251de03be6989dfa7a08952fcd8c136
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with heuristics indicating it functions as a link farm. Several URLs point to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://soosekszer.hu/upload/files/wobiwolilugobewegit.pdf In PDF document text
    • https://infrastone.com/userfiles/files/lufapun.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc58ed4ca81---nazowe.pdfIn PDF document text
    • https://33mobility.net/uploads/files/putisuvafemosavude.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f72d80a26---62118700349.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/pufodigebiduzaposewof.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e97a31dc---kawepowadigubix.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/betuzuparujuvolofigemuset.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e37d6e11---48921461555.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/79259914559.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/dazekoz.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/83306006610.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/bagisudozemed.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd18054f96e---mesajadomuzegat.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c54c687b15---tetazowowezorew.pdfIn PDF document text
    • http://placc.info/up_image/65452513586.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/203df653008c9c62c4834d36c7f16996/vamobopiboto.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/83145727426.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/nobunofagujuwum.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dad583644b4---zezufifufus.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/59242478776.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/71811558182.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/d9djsgosf8glj430vm573fhlj1/79151545188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=properties+of+multiplication+examples+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 17856 bytes
SHA-256: 212be18500ae25d5f4cc9c162a7d93be0e09c8ac3388dec9d91558629a13493f
font_02_sfnt_off00012352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12352 10984 bytes
SHA-256: 729365b1b65978c8c3091d39408a09d8e13fed95e1d2a1989277db57df817bac

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